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WorksheetsLATHE-WORKING AND OPERATION
Total questions: 34
Worksheet time: 30mins
Which machine tool is known as the mother machine tool?
Drill
Milling
Lathe
None of mentioned
Which type of surface is produced by turning operation in lathe machine?
Flat
Cylindrical
Taper
None of the mentioned
What is the necessary condition for turning?
Material of work piece should be harder than the cutting tool
Cutting tool should be harder than the material of work piece
Hardness of the cutting tool and material of of piece should be same
None of the mentioned
Traversing of tool parallel to the axis of job is termed as_____
Cross feed
Longitudinal feed
Both cross feed and traversing feed
None of the mentioned
Which type of lathe is also known as centre lathe?
engine lathe
bench lathe
room lathe
capstan lathe
Lathe can be classified on the basis of_____
designs and construction
fundamental principle
function performance
all of the mentioned
For performing which kind of operations, it ( tailstock ) holds a tool?
drilling
reaming
tapping
all of the mentioned
How many types of movements are possible in carriage?
2
3
4
5
In how many parts, carriage can be divided?
2
3
4
5
The cross slide functions_____ to the lathe axis.
parallel
perpendicular
anti-parallel
none of the mentioned
The layout of the_____ includes an interlocking device.
saddle
cross slide
apron
swivel base
Increased feed_____
increases tool’s life
decreases tool’s life
no effect on tool’s life
none of the mentioned
How many main type of centres are there in lathe (most commonly)?
1
2
3
4
Which type of centre is used to drill holes across the round job by using a drill bit in the head-stock spindle?
swivel V centre
female centre
half centre
none of the mentioned
Which of the following chuck is also known as dog chuck?
four jaw chuck
three jaw chuck
two jaw chuck
none of the mentioned
Face plates are used with_____ accessories.
clamps
T- bolts
stepped block
all of the mentioned
Which of the following cutting material cannot be forged to shape easily?
carbides
ceramic
stellites
none of the mentioned
Grinding can be performed by______
using faceplates or angle plates
using chucks
special attachments
none of the mentioned
Reaming and counter boring can be performed by______
centres
face plates and angle plates
special attachments
none of the mentioned
Which of the following is the right formula for taper?
K= (D-d) / L
K= L / (D-d)
K= D/ L
none of the mentioned
Find the value of d. K=1/10, L= 10 mm, D=65 mm.
45 mm
55 mm
65 mm
75 cm
The _____ motion is converted into_____ motion of the tool slide in thread cutting.
rotary, feed
feed, rotary
transmitting, longitudinal
none of the mentioned
Which of the following represents the formula for cutting speed? cs =cutting speed, D= diameter of work, N= rpm.
cs = (3.14*D*N)
cs = (3.14*D)/N
cs = (D*N)
none of the mentioned
Which of the following represents the formula for metal removal rate? a=cutting speed, b=depth of cut, c=feed, d=revolution
(a*b*d)/c
(a*b)/(c*d)
(a*b*c)/d
none of the mentioned
Machine tools can be classified as _____
geometric shape of the work piece
number of the work piece
function of the machine
all of the mentioned
Lathe bed is usually made of.......
Structural steel
Stainless steel
Cast iron
Mild steel
The purpose of tumbler gears in lathe is to.........
Cut threads
Reduce spindle speed
Give desired direction of movement to the lathe carriage
Reverse spindle rotation
Estimate the machining time to turn a MS bar of 5 cm diameter down to 4.5 cm for a length of 10 cm in a single cut. Assume cutting speed = 40 m/min and feed = 0.3 mm/rev.
1 min
1.15 min
1.30 min
1.45 min
Find the total time required to turn a 60 mm diameter rod to the dimensions shown in figure. Take cutting speed as 30 m/min, feed as 1.5 mm. All cuts are 3 mm deep.
1.58 min
1.62 min
1.66 min
1.70 min
A mild steel bar is turned on a lathe at a rotational speed of 150 rpm over its 120 mm length using 0.5 mm feed per revolution. If the cutting force 1600 N and diameter of the bar is 60 mm, then the amount of heat generated during cutting
642 w
752 w
862 w
942 w
What is 'swing' of a center lathe?
length of the bed
maximum diameter of a piece or work that can fit in the lathe
maximum length of cross slide movement
None of these.
A 100 mm long 10 mm diameter stainless steel rod is to be reduced in diameter to 8 mm by turning on a lathe in one pass. The spindle rotates at 400 rpm, and the tool is traveling at an axial speed of 175 mm/min. Calculate the time required for machining the steel rod.
0.42 min
0.47 min
0.52 min
0.57 min
A 180-mm-long, 65-mm-diameter titanium- alloy rod is being reduced in diameter to 55 mm by turning on a lathe in one pass. The spindle rotates at 400 rpm and the tool is traveling at an axial velocity of 220 mm/min. Calculate the material removal rate in mm3/sec
3000 mm3/sec
3500 mm3/sec
4000 mm3/sec
4500 mm3/sec
Estimate the machining time required in rough turning a 2 m-long, annealed aluminum-alloy round bar 50-mm in diameter, using a high-speed-steel tool, Let feed = 2 mm/rev and maximum cutting speed of 5 m/s
0.3 min
0.4 min
0.5 min
0.6 min
